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74 lines
1.6 KiB
ArmAsm
74 lines
1.6 KiB
ArmAsm
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; Christian Groessler, Dec-2001
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;
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; ucase_fn
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; helper routine to convert a string (file name) to uppercase
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; used by open.s and remove.s
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;
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; Calling parameters:
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; AX - points to filename
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; Return parameters:
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; C - 0/1 for OK/Error (filename too long)
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; AX - points to uppercased version of the filename on the stack
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; tmp3 - amount of bytes used on the stack (needed for cleanup)
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; Uses:
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; ptr4 - scratch pointer used to remember original AX pointer
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;
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;
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.include "atari.inc"
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.importzp tmp3,ptr4,sp
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.import _strupr,subysp
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.export ucase_fn
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ucase_fn: .proc
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; we make sure that the filename doesn't contain lowercase letters
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; we copy the filename we got onto the stack, uppercase it and use this
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; one to open the iocb
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; we're using tmp3, ptr4
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; save the original pointer
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sta ptr4
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stx ptr4+1
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; now we need the length of the name
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ldy #0
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loop: lda (ptr4),y
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beq str_end
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cmp #ATEOL ; we also accept Atari EOF char as end of string
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beq str_end
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iny
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bne loop ; not longer than 255 chars (127 real limit)
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toolong:sec ; indicate error
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rts
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str_end:iny ; room for terminating zero
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cpy #128 ; we only can handle lenght < 128
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bcs toolong
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sty tmp3 ; save size
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jsr subysp ; make room on the stack
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; copy filename to the temp. place on the stack
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lda #0 ; end-of-string
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sta (sp),y ; Y still contains length + 1
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dey
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loop2: lda (ptr4),y
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sta (sp),y
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dey
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bpl loop2 ; bpl: this way we only support a max. length of 127
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; uppercase the temp. filename
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ldx sp+1
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lda sp
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jsr _strupr
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; leave X and Y pointing to the modified filename
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lda sp
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ldx sp+1
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clc ; indicate success
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rts
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ucase_fn: .endproc
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